EP2176460B1 - Boiler having a section for preheating water - Google Patents

Boiler having a section for preheating water Download PDF

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Publication number
EP2176460B1
EP2176460B1 EP08789541A EP08789541A EP2176460B1 EP 2176460 B1 EP2176460 B1 EP 2176460B1 EP 08789541 A EP08789541 A EP 08789541A EP 08789541 A EP08789541 A EP 08789541A EP 2176460 B1 EP2176460 B1 EP 2176460B1
Authority
EP
European Patent Office
Prior art keywords
water
section
heating device
boiler
space
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP08789541A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2176460A1 (en
Inventor
Mohankumar Valiyambath Krishnan
Hock S. Tiew
Boon K. Ching
Tamilselvan Thirumazhisai Sankaralingam
Yen L. Pang
Mo T. Ng
Ajit P. Singh
Asok K. Kasevan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to EP08789541A priority Critical patent/EP2176460B1/en
Publication of EP2176460A1 publication Critical patent/EP2176460A1/en
Application granted granted Critical
Publication of EP2176460B1 publication Critical patent/EP2176460B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F75/00—Hand irons
    • D06F75/08—Hand irons internally heated by electricity
    • D06F75/10—Hand irons internally heated by electricity with means for supplying steam to the article being ironed
    • D06F75/12—Hand irons internally heated by electricity with means for supplying steam to the article being ironed the steam being produced from water supplied to the iron from an external source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/28—Methods of steam generation characterised by form of heating method in boilers heated electrically
    • F22B1/284—Methods of steam generation characterised by form of heating method in boilers heated electrically with water in reservoirs
    • F22B1/285—Methods of steam generation characterised by form of heating method in boilers heated electrically with water in reservoirs the water being fed by a pump to the reservoirs

Definitions

  • the present invention relates to a device comprising a shell which encloses a space for containing a quantity of water that is intended to be heated, and at least one inlet for letting water into the space.
  • a boiler for generating steam by boiling water is a well-known example of a device as mentioned hereinabove.
  • many types of such boilers are available, and are used in various fields, including fields like steam cleaning and steam ironing.
  • a reduction of the cooling effect of a supply of fresh water to a quantity of hot water may be obtained in a relatively simple manner, namely by increasing the quantity of hot water.
  • this solution involves other disadvantages like an increased startup time and an increased size of the boiler.
  • a water heating device with the features of the preamble of claim 1 is disclosed in DE-4141370 A1 .
  • This objective is achieved by means of a device of which the space for containing water is divided into at least two sections, wherein only a first section is adapted to receive water to be supplied through the inlet during operation, and wherein the first section is adapted to contain a limited quantity of water and allow overflow of water to a second section should the first section be completely filled with water.
  • water that is newly supplied to the space enclosed by the shell of the device is first received in the first section of the space.
  • the hot water may be situated in the second section of the space.
  • the supply of water to the second section exclusively takes place on the basis of overflow of the first section.
  • Water that flows from the first section to the second section may be water that has been in the first section for some time, which is the case when fresh water is supplied to the first section at a position outside the area where the overflow takes place.
  • the water that is supplied to the second section is preheated, as the water has been present in a hot environment for some time, so that the cooling effect of the supply of water is reduced to a considerable extent.
  • the heating process of the water that is present in the first section may be enhanced, for example by associating the first section with heating means of the device.
  • the device according to the present invention When the device according to the present invention is used for the purpose of generating steam, it is possible to realize a continuous steam output.
  • the extent to which water is preheated in the first section may be such that a boiling process of water in the second section is not interrupted in case of an overflow of water from the first section to the second section.
  • An important advantage of the present invention is that the set objective is achieved on the basis of a division of the space for containing water in at least two separate sections, which does not require the application of complex measures.
  • the division of the space may be realized in any suitable manner.
  • a wall is arranged inside the space, the wall serving for both forming a partition between the first section and the second section, and partly enclosing the first section.
  • the wall is thermally connected to the shell, so that it is ensured that the wall is heated to some extent during operation of the device, which contributes to the heating process of water in the first section.
  • the wall may simply be a straight wall which is upright in a normal orientation of the device, but it is also possible that the wall has a totally different shape.
  • the wall may be shaped like the wall of a bowl.
  • the bowl shape contributes to the heating process of water contained inside the bowl, as the surface/volume relation of a bowl is advantageous as far as heating is concerned.
  • the wall may also be shaped like a wall of a tube.
  • a tube also has an advantageous surface/volume relation.
  • the device according to the present invention comprises at least one element for heating water.
  • the wall which partly encloses the first section is thermally connected to the heating element.
  • the first section is located at a position which is above the heating element in a normal operational position of the device. In that case, it is possible for water flowing from the first section to fall directly on the heating element, so that a most efficient steam generating process is obtained, as the water supply from the first section is a gradual water supply which only involves relatively small quantities of water.
  • a partition between the first section and the second section of the space for containing water is obtained by applying a wall as described hereinabove.
  • a step is arranged in the shell, in particular in a portion of the shell which is at the bottom in a normal orientation of the device. When the bottom is held in an inclined position with respect to the horizontal, two separate sections which are each suitable for containing a quantity of water may be distinguished, thus allowing overflow of water from one section to another to take place at the top side of the step.
  • the device according to the present invention is particularly suitable to be applied as a domestic steaming device.
  • the present invention also relates to an assembly comprising a water heating device of which a space for containing water is divided into at least two sections as described in the foregoing, and means for supplying water to said space.
  • Operation of the water supplying means may be controlled by means for sensing the water level in the second section of the space of the water heating device.
  • the sensing and controlling means transmit a signal for operating the water supplying means.
  • water is supplied to the space of the water heating device, the water being first received in the first section of the space.
  • Water is supplied to the second section of the space as soon as overflow of water from the first section takes place.
  • the operation of the water supplying means is terminated as soon as the water level in the second section is at least at the predetermined level.
  • the assembly may comprise a water reservoir, a conduit extending from the water reservoir to the inlet of the water heating device, and means for forcing water to flow from the water reservoir to the inlet of the water heating device.
  • the latter means may comprise any suitable type of pump, for example.
  • the assembly may comprise a device for letting out steam, such as a steam iron, which is connected to the water heating device through a hose cord.
  • the device for letting out steam is a boiler type iron, wherein an auto-refill configuration for the boiler is provided using a pump to draw water from a separate or external water tank, so that replenishment of water automatically takes place during operation of the assembly.
  • Fig. 1 shows a steam ironing system 1, which comprises a steam iron 2 and a stand 3.
  • the steam iron 2 has a soleplate 4 that is heated during operation, and is capable of supplying steam to objects to be ironed during operation for the purpose of facilitating the ironing process.
  • a water reservoir 5 and a boiler 6 for heating water to steam are arranged in the stand 3.
  • the steam iron 2 is connected to the boiler 6 through a hose cord 7.
  • the boiler 6 is operated such as to generate steam, and the steam is supplied to the steam iron 2 through the hose cord 7.
  • water is transferred from the water reservoir 5 to the boiler 6.
  • Fig. 2 shows a boiler 6 according to a first preferred embodiment of the present invention, which comprises a shell 8 and a heating element 9 arranged against an exterior surface 10 of the shell 8.
  • a space 11 enclosed by the shell 8 is intended to be partly filled with water.
  • the boiler 6 has an inlet 12 for letting water into the space 11.
  • Fig. 2 shows a water reservoir 5, a water conduit 13 for transporting water from the water reservoir 5 to the space 11 of the boiler 6, and a pump 14 which is arranged at a position in the water conduit 13, and which serves for forcing water to flow through the water conduit 13 in a predetermined direction, namely in a direction from the water reservoir 5 to the boiler 6.
  • a container 15 having a space 16 for containing a limited quantity of water is arranged inside the space 11 of the boiler 6, a container 15 having a space 16 for containing a limited quantity of water is arranged.
  • shell space 1 the space 11 enclosed by the shell 8 of the boiler 6
  • container space 16 the space 16 of the container 15
  • the container 15 is shaped like a bowl, wherein a wall 17 of the container 15 comprises a circular bottom portion 18 and an upright, cylindrical portion 19 extending from the circumference of the bottom portion 18 so as to taper in a direction away from (?) the bottom portion 18.
  • the container 15 is arranged right underneath the inlet 12, and the water conduit 13 extends through the inlet 12, wherein an end portion of the water conduit 13 extends inside the container 15, and an open end of the water conduit 13 forms an outlet of the water conduit 13 near the bottom portion 18 of the wall 17 of the container 15.
  • the boiler 6 is intended to be applied for the purpose of generating steam, and in view of this, the boiler 6 is equipped with a valve 20, preferably an E valve which is arranged at a top side of the shell 8, which is adapted to letting out steam from the shell space 11.
  • a valve 20 preferably an E valve which is arranged at a top side of the shell 8, which is adapted to letting out steam from the shell space 11.
  • the heating element 9 is operated for generating the heat that is necessary for turning water into steam.
  • the formation of steam takes place by heating a quantity of water that is present in a lower portion 21 of the shell space 11. This quantity of water is obtained by filling the container 15 and allowing for an overflow of the container 15.
  • a flow of water from the container 15 to the lower portion 21 of the shell space 11 is represented as a row 22 of droplets.
  • the pump 14 is operated to transfer water from the water reservoir 5 to the boiler 6.
  • the water is supplied to the container 15, at the position where the water conduit 13 ends, i.e. close to the bottom portion 18 of the wall 17 of the container 15.
  • overflow takes place at the top side of the container 15, so that water flows from the container 15 to the lower portion 21 of the shell space 11.
  • means 23 which are adapted to function as a level sensor and to transmit operation signals to the pump 14 may be provided, wherein these means 23 may be designed in any suitable way.
  • these means 23 may be designed for detecting a water level by means of a float (not shown), but this is just one of the various possibilities.
  • the means 23 should be controlling the pump 14 in such a way that the water supply from the water reservoir 5 is started when the water level in the lower portion 21 of the shell space 11 is at or lower than a predetermined minimum, and that the water supply is terminated again when the water level is at or higher than a predetermined maximum.
  • a first section is the container space 16 and a second section is the lower portion 21 of the shell space 11. Only water that is present in the second section 21 is used in the process of generating steam.
  • An important advantage of the present invention resides in the fact that fresh water, i.e. water from the water reservoir 5, is received in the first section 16, and is not allowed to flow directly to the second section 21, so that a process of forming steam is not hindered by a supply of water at a relatively low temperature. It may be said that the first section 16 functions as means for hindering a direct supply of water to the second section 21 on the basis of its capability of holding a certain quantity of water.
  • Water that is present in the container 15 is preheated on the basis of the fact that the container 15 is located in an environment where hot water and steam are present, and is surrounded by hot elements such as the heating element 9 and the shell 8.
  • hot elements such as the heating element 9 and the shell 8.
  • the wall 17 of the container 15 may be thermally connected to the shell 8, for example by welding or brazing.
  • this may be any suitable material, for example a metal, a silicon material or a plastic.
  • Fig. 3 shows a boiler 6 according to a second preferred embodiment of the present invention.
  • the container 15 is placed directly above the heating element 9, and water overflowing from the container 15 is allowed to fall directly on the heating element 9.
  • a very effective heating process of the water present inside the container 15 may take place, as this heating process is under direct influence of the heating element 9, and that a very effective steam generating process may take place as well, as this process is performed on the basis of the supply of a relatively small flow of hot water from the container 15, wherein the hot water evaporates shortly after it has hit the heating element 9.
  • Fig. 4 in which a boiler 6 according to a third preferred embodiment of the present invention is shown.
  • Fig. 5 shows a boiler 6 according to a fourth preferred embodiment of the present invention.
  • this boiler 6 comprises a tube 24 having a tube wall 25 delimiting an inner space 26 of the tube 24, which is arranged in the shell space 11.
  • the tube 24 is coiled and/or bent for compactness.
  • An end portion 27 of the tube 24 is inclined in an upward direction, so that it is only possible for water to flow from the tube 24 when the pump 14 is operated. Only water that has passed through the whole tube 24 is released from the tube 24 when overflow of the tube 24 takes place under the influence of an operation of the pump 14, so that it is ensured that the water that is supplied to the lower portion 21 of the shell space 11 is preheated.
  • the tube wall 25 is thermally connected to the shell 8.
  • Fig. 6 shows a boiler 6 according to a fifth preferred embodiment of the present invention.
  • This boiler 6 does not comprise something like a container 15 or a tube 24. Instead, in this boiler 6, two sections 28, 29 of the shell space 11 are created by an upright wall 30, which serves as a partition between the sections 28, 29.
  • the water conduit 13 extends through the inlet 12, wherein an end portion of the water conduit 13 extends inside a first section 28, and an open end of the water conduit 13 is located near a bottom of the first section 28.
  • the wall 30 does not extend all the way from a bottom 31 of the shell 8 to a top 32 of the shell 8, so that there is a possibility of overflow from the first section 28 to the second section 29 at a top of the wall 30. Such an overflow is indicated in Fig. 6 by means of a bent arrow.
  • Water that is present inside the second section 29 is used in a steam generating process.
  • Supply of water to the second section 29 only takes place in an indirect manner, namely through the first section 28.
  • Fresh water enters the first section 28 near a bottom of the first section 28, and is heated during its stay in the first section 28 and on its way to a top of the first section 28.
  • the heating process of the water in the first section 28 takes place under the influence of various sources of heat, including the heating element 9 which is a primary source of heat, and the shell 8, the wall 30, and the steam that is generated.
  • Fig. 7 shows a boiler 6 according to a sixth preferred embodiment of the present invention. It is noted that for the sake of clarity, Fig. 7 only shows a water conduit 13 and a pump 14 besides the boiler 6, wherein the water reservoir 5 is not shown.
  • a special feature of the boiler 6 is that a bottom 31 of the shell 8 is provided with a step 33.
  • the boiler 6 is kept in an inclined orientation, i.e. an orientation in which a bottom 31 and a top 32 of the shell 8 extend in a direction which deviates from the horizontal.
  • the bottom 31 has an inclined orientation and a step 33 is arranged at the bottom 31, two separate sections 28, 29 which are suitable for containing a quantity of water are realized.
  • the inlet 12 is arranged such that water that is supplied to the boiler 6 reaches the first section 28 at a position which is at another side of the first section 28 than the side where the first section 28 adjoins the second section 29. In this way, it is achieved that water which is supplied from the first section 28 to the second section 29 during overflow of the first section 28 is water that has been in the first section 28 for some time and that has been heated as a consequence of a stay in a hot environment. It is noted that like in Fig. 6 , an overflow is indicated in Fig. 7 by means of a bent arrow. Overflow takes place as soon as the first section 28 is completely filled with water and the water supply to the boiler 6 is maintained.
  • the heating element 9 of the boiler 6 is arranged such as to directly heat the second section 29, which is advantageous in view of the fact that a steam generating process is performed in this section 29.
  • All of the shown embodiments of a boiler 6 according to the present invention have a number of features in common.
  • a first section 16, 26, 28 is located such as to receive a supply of fresh water to the boiler 6, and a second section 21, 29 is located such as to receive water from the first section 16, 26, 28 when overflow of the first section 16, 26, 28 takes place under the influence of a continuous supply of fresh water.
  • a steam generating process takes place in the second section 21, 29.
  • Due to the fact that the second section 21, 29 is only indirectly filled with water, namely by a flow of water from the first section 16, 26, 28, it is possible to have an undisturbed process.
  • the water may be heated in the first section 16, 26, 28 first before overflowing into the second section 21, 29.
  • a water conduit 13 and a pump 14 may be applied, wherein the water may be taken from a water reservoir 5.
  • the operation of the pump 14 may be controlled on the basis of a detection of the water level in the second section 21, 29.
  • the pump 14 is operated until the water level is at an appropriate level again.
  • the first section 16, 26, 28 is filled with water, such that at a certain point overflow from the first section 16, 26, 28 into the second section 21, 29 occurs.
  • the first section 16, 26, 28 may comprise an inner space of an actual member for receiving and containing water, which is arranged inside the shell 8 of the boiler 6, such as the shown container 15 or the shown tube 24.
  • an actual member for receiving and containing water which is arranged inside the shell 8 of the boiler 6, such as the shown container 15 or the shown tube 24.
  • two sections are created by having a partition at an appropriate position in the shell space 11, wherein the partition may be obtained on the basis of an actual wall 30, or a step 33 in a shell bottom 31, for example.
  • the boiler 6 when the boiler 6 according to the present invention is used for the purpose of delivering steam to another device such as a steam iron 2, the following takes place.
  • the boiler 6 demands water, this is supplied to the first section 16, 26, 28 of the shell space 11 of the boiler 6.
  • the water that is already present in the first section 16, 26, 28 is almost at a temperature of the boiler 6.
  • the water that is supplied to the first section 16, 26, 28 displaces a quantity of water in the first section 16, 26, 28, which overflows to a second section 21, 29 of the shell space 11, in which an actual steam generating process takes place under the influence of heating means 9 of the boiler 6. Since the water reaching the second section 21, 29 is already hot, the temperature reduction is minimal, so that a reduction or even interruption of the steam output, which otherwise happens when cold water is directly supplied to the area where the water is boiling and steam is being formed, is avoided.
  • An advantage of the present invention is that only a division of the shell space 11 of the boiler 6 in two sections is needed for the purpose of guaranteeing continuous steam production. It is not necessary to provide additional means for preheating water before the water is supplied to the section where the actual steam generating process takes place, as use is made of the fact that the shell space 11 constitutes a hot environment.

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Sustainable Energy (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Sustainable Development (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Cookers (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
  • Commercial Cooking Devices (AREA)
  • Apparatus For Making Beverages (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)
EP08789541A 2007-08-14 2008-08-05 Boiler having a section for preheating water Not-in-force EP2176460B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08789541A EP2176460B1 (en) 2007-08-14 2008-08-05 Boiler having a section for preheating water

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP07114333 2007-08-14
PCT/IB2008/053117 WO2009022260A1 (en) 2007-08-14 2008-08-05 Boiler having a section for preheating water
EP08789541A EP2176460B1 (en) 2007-08-14 2008-08-05 Boiler having a section for preheating water

Publications (2)

Publication Number Publication Date
EP2176460A1 EP2176460A1 (en) 2010-04-21
EP2176460B1 true EP2176460B1 (en) 2012-10-10

Family

ID=40032556

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08789541A Not-in-force EP2176460B1 (en) 2007-08-14 2008-08-05 Boiler having a section for preheating water

Country Status (8)

Country Link
US (1) US8726544B2 (pt)
EP (1) EP2176460B1 (pt)
JP (1) JP2010536411A (pt)
KR (1) KR101493265B1 (pt)
CN (1) CN101784719B (pt)
BR (1) BRPI0815223A8 (pt)
RU (1) RU2470104C2 (pt)
WO (1) WO2009022260A1 (pt)

Families Citing this family (8)

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EP2287381A1 (en) * 2009-08-17 2011-02-23 BSH Bosch und Siemens Hausgeräte GmbH Steam generator for use in a laundry appliance, and laundry appliance
US9008495B2 (en) 2012-03-01 2015-04-14 Joo Hyun Kim Fluid heater and method of use thereof
CN103510375B (zh) 2012-06-25 2017-06-09 皇家飞利浦电子股份有限公司 用于蒸汽生成设备的水腔
US20150191866A1 (en) * 2014-01-06 2015-07-09 Techtronic Floor Care Technology Limited Portable garment steamer
RU2650059C1 (ru) * 2014-08-26 2018-04-06 Конинклейке Филипс Н.В. Паровая головка утюга
DE202016103207U1 (de) * 2016-06-16 2016-06-30 Chi Kin Chan Verdampfungsvorrichtung sowie Dampfbügeleisen
CN111174417B (zh) * 2020-01-10 2021-06-22 绍兴市沂风机械有限公司 一种高效速热式家用电热水器
DE102021201861A1 (de) 2021-02-26 2022-09-01 BSH Hausgeräte GmbH Verdampfer für ein Dampfgargerät, welcher eine Überlaufvorrichtung aufweist, sowie Dampfgargerät

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Also Published As

Publication number Publication date
RU2470104C2 (ru) 2012-12-20
WO2009022260A1 (en) 2009-02-19
US8726544B2 (en) 2014-05-20
US20110265354A1 (en) 2011-11-03
BRPI0815223A8 (pt) 2015-09-29
KR101493265B1 (ko) 2015-02-16
JP2010536411A (ja) 2010-12-02
KR20100054148A (ko) 2010-05-24
EP2176460A1 (en) 2010-04-21
RU2010109361A (ru) 2011-09-20
CN101784719A (zh) 2010-07-21
BRPI0815223A2 (pt) 2015-03-31
CN101784719B (zh) 2012-02-22

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